A liquid jet recording process comprises the step of providing a continuous passageway defining a path through which liquid can flow. The passageway has an inlet thereto and an outlet orifice therefrom and further defines a thermal chamber portion located directly in the path intermediate the inlet and...http://www.google.com/patents/US4723129?utm_source=gb-gplus-sharePatent US4723129 - Bubble jet recording method and apparatus in which a heating element generates bubbles in a liquid flow path to project droplets
